American heavy metal band Metallica has cancelled its upcoming tour of Australia and New Zealand, saying that lead singer and guitarist James Hetfield has been admitted into an addiction treatment program.

Hetfield’s fellow band members, Lars Ulrich, Kirk Hammett, and Robert Trujillo, issued a joint statement on the band’s Instagram account stating they were “devastated” by the decision.

“We fully intend to make our way to your part of the world as soon as health and schedule permit,” the statement said.

Metallica was due to play their first Australian show on Oct. 17. The band’s Australian touring company, Live Nation, said tickets to the shows would be refunded and alternative tour dates were being discussed.